From 7cfc4e5146be5666419451bdd516f1f3f264d24a Mon Sep 17 00:00:00 2001
From: Enrico Tassi <gareuselesinge@debian.org>
Date: Sun, 25 Jan 2015 14:42:51 +0100
Subject: Imported Upstream version 8.5~beta1+dfsg

---
 library/keys.ml | 170 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 library/keys.ml

(limited to 'library/keys.ml')

diff --git a/library/keys.ml b/library/keys.ml
new file mode 100644
index 00000000..3d277476
--- /dev/null
+++ b/library/keys.ml
@@ -0,0 +1,170 @@
+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(** Keys for unification and indexing *)
+
+open Globnames
+open Term
+open Libobject
+
+type key = 
+  | KGlob of global_reference
+  | KLam 
+  | KLet
+  | KProd
+  | KSort
+  | KEvar
+  | KCase 
+  | KFix 
+  | KCoFix
+  | KRel 
+  | KMeta
+
+module KeyOrdered = struct
+  type t = key
+
+  let hash gr =
+    match gr with
+    | KGlob gr -> 10 + RefOrdered.hash gr
+    | KLam -> 0
+    | KLet -> 1
+    | KProd -> 2
+    | KSort -> 3
+    | KEvar -> 4
+    | KCase -> 5
+    | KFix -> 6
+    | KCoFix -> 7
+    | KRel -> 8
+    | KMeta -> 9
+
+  let compare gr1 gr2 =
+    match gr1, gr2 with
+    | KGlob gr1, KGlob gr2 -> RefOrdered.compare gr1 gr2
+    | _, KGlob _ -> -1
+    | KGlob _, _ -> 1
+    | k, k' -> Int.compare (hash k) (hash k')
+    
+  let equal k1 k2 =
+    match k1, k2 with
+    | KGlob gr1, KGlob gr2 -> RefOrdered.equal gr1 gr2
+    | _, KGlob _ -> false
+    | KGlob _, _ -> false
+    | k, k' -> k == k'
+end
+
+module Keymap = HMap.Make(KeyOrdered)
+module Keyset = Keymap.Set
+
+(* Mapping structure for references to be considered equivalent *)
+
+type keys = Keyset.t Keymap.t
+
+let keys = Summary.ref Keymap.empty ~name:"Keys_decl"
+
+let add_kv k v m =
+  try Keymap.modify k (fun k' vs -> Keyset.add v vs) m
+  with Not_found -> Keymap.add k (Keyset.singleton v) m
+
+let add_keys k v = 
+  keys := add_kv k v (add_kv v k !keys)
+
+let equiv_keys k k' =
+  k == k' || KeyOrdered.equal k k' ||
+    try Keyset.mem k' (Keymap.find k !keys)
+    with Not_found -> false
+
+(** Registration of keys as an object *)
+
+let load_keys _ (_,(ref,ref')) =
+  add_keys ref ref'
+
+let cache_keys o =
+  load_keys 1 o
+
+let subst_key subst k = 
+  match k with
+  | KGlob gr -> KGlob (subst_global_reference subst gr)
+  | _ -> k
+
+let subst_keys (subst,(k,k')) =
+  (subst_key subst k, subst_key subst k')
+
+let discharge_key = function
+  | KGlob g when Lib.is_in_section g ->
+    if isVarRef g then None else Some (KGlob (pop_global_reference g))
+  | x -> Some x
+
+let discharge_keys (_,(k,k')) =
+  match discharge_key k, discharge_key k' with 
+  | Some x, Some y -> Some (x, y)
+  | _ -> None
+
+let rebuild_keys (ref,ref') = (ref, ref')
+
+type key_obj = key * key
+
+let inKeys : key_obj -> obj =
+  declare_object {(default_object "KEYS") with
+    cache_function = cache_keys;
+    load_function = load_keys;
+    subst_function = subst_keys;
+    classify_function = (fun x -> Substitute x);
+    discharge_function = discharge_keys;
+    rebuild_function = rebuild_keys }
+
+let declare_equiv_keys ref ref' =
+  Lib.add_anonymous_leaf (inKeys (ref,ref'))
+
+let constr_key c =
+  let open Globnames in 
+  try 
+    let rec aux k = 
+      match kind_of_term k with
+      | Const (c, _) -> KGlob (ConstRef c)
+      | Ind (i, u) -> KGlob (IndRef i)
+      | Construct (c,u) -> KGlob (ConstructRef c)
+      | Var id -> KGlob (VarRef id)
+      | App (f, _) -> aux f
+      | Proj (p, _) -> KGlob (ConstRef (Names.Projection.constant p))
+      | Cast (p, _, _) -> aux p
+      | Lambda _ -> KLam 
+      | Prod _ -> KProd
+      | Case _ -> KCase
+      | Fix _ -> KFix
+      | CoFix _ -> KCoFix
+      | Rel _ -> KRel
+      | Meta _ -> raise Not_found
+      | Evar _ -> raise Not_found
+      | Sort _ -> KSort 
+      | LetIn _ -> KLet
+    in Some (aux c)
+  with Not_found -> None
+
+open Pp
+
+let pr_key pr_global = function
+  | KGlob gr -> pr_global gr
+  | KLam -> str"Lambda"
+  | KLet -> str"Let"
+  | KProd -> str"Product"
+  | KSort -> str"Sort"
+  | KEvar -> str"Evar"
+  | KCase -> str"Case"
+  | KFix -> str"Fix"
+  | KCoFix -> str"CoFix"
+  | KRel -> str"Rel"
+  | KMeta -> str"Meta"
+
+let pr_keyset pr_global v = 
+  prlist_with_sep spc (pr_key pr_global) (Keyset.elements v)
+
+let pr_mapping pr_global k v = 
+  pr_key pr_global k ++ str" <-> " ++ pr_keyset pr_global v
+
+let pr_keys pr_global =
+  Keymap.fold (fun k v acc -> pr_mapping pr_global k v ++ fnl () ++ acc) !keys (mt())
-- 
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